Lock, method for dismounting lock and method for mounting lock

BACKGROUND OF THE INVENTION

1. Field of the Invention

0001The present disclosure relates to a lock, a method for dismounting the lock and a method for mounting the lock, and more particularly, to a lock which is easy to mount and dismount, a method for dismounting the lock and a method for mounting the lock.

2. Description of the Prior Art

0002A typical door lock includes an exterior handle set, an interior handle set and a latch mechanism which are mounted to a door in an assembling manner. The latch mechanism is typically mounted on the door first. Then, the interior and exterior handle sets on both sides of the door are aligned with and connected to the latch mechanism. Afterwards, the interior and exterior handle sets are aligned with and fixedly connected to each other by screws. However, during the connecting process, a user needs to hold the interior and exterior handle sets with one hand while operating a screwdriver to screw the screws with another hand. Because the position of the interior and exterior handle sets is hard to maintain, the smoothness of operating the screwdriver of the user is affected, which causes inconvenience of mounting the door lock.

0003Furthermore, for enhancing the appearance of the door lock, the screws are usually covered by the decoration cover of the interior handle set or the exterior handle set. When the door lock is broken and needs to be repaired or replaced, the user has to remove the decoration cover before operating the screwdriver to unscrew the screws to dismount the interior handle set or the exterior handle set from the door. However, the necessary of repairing or replacing the door lock usually happens after the door lock has been purchased for quite a while. The user may have lost the operation manual of the door lock. Alternatively, the user may still keep the operation manual, but the user still cannot understand how to remove the decoration cover due to the limitation of the written expression. As a result, it is difficult for the user to dismount the door lock by himself/herself. Therefore, the typical door lock has drawbacks of inconvenience of mounting and dismounting.

SUMMARY OF THE INVENTION

0004According to an embodiment of the present disclosure, a lock defining a rotating axis and being installed on a door includes a mounting plate, a fastening member and a first handle set. The mounting plate is disposed on a side of the door. The mounting plate includes a mounting plate body and a protruding lug connected to the mounting plate body. The mounting plate body includes a locking slot structure. The protruding lug includes a fastening hole. The fastening member is inserted through the fastening hole of the protruding lug to fix the mounting plate on the door. The first handle set is assembled on the mounting plate. The first handle set includes an engaging structure and a decoration cover. The engaging structure is engaged with the locking slot structure to fix the first handle set on the mounting plate. The decoration cover covers the mounting plate. The decoration cover includes an opening corresponding to the fastening hole. The protruding lug protrudes from the mounting plate body toward the first handle set along the rotating axis. A dimension of the opening of the decoration cover is greater than a maximum radial dimension of the fastening member.

0005According to another embodiment of the present disclosure, a method for dismounting the aforementioned lock from the door includes steps as follows. A tool is used to unfasten the fastening member via the opening of the decoration cover such that the fastening member is no longer in a fastened state. The first handle set is moved away from the door such that the first handle set and the mounting plate are dismounted from the door.

0006According to yet another embodiment of the present disclosure, a method for mounting a lock on a door is disclosed. The lock includes a mounting plate and a first handle set. The mounting plate includes a locking slot structure. The first handle set includes a cover plate, a first handle and a first abutting feature. The cover plate includes an engaging structure and a second abutting structure. The first handle is rotatably connected to the cover plate. The first abutting feature is connected to the first handle in a manner that the first abutting feature is moved synchronously with the first handle. The method includes steps as follows. The mounting plate is fixed on a side of the door. The engaging structure of the cover plate is aligned with the locking slot structure of the mounting plate. The first handle is rotated such that the first abutting feature abuts against the second abutting feature to bring the cover plate to rotate with the first handle. The engaging structure is brought to engage with the locking slot structure to fix the first handle set on the mounting plate.

0007According to yet another embodiment of the present disclosure, a method for dismounting a lock from a door is disclosed. The lock includes a mounting plate and a first handle set. The mounting plate is fixed on a side of the door and includes a locking slot structure. The first handle set includes a cover plate. The cover plate includes an engaging structure and an indentation. The engaging structure is engaged with the locking slot structure to fix the first handle set on the mounting plate. The indentation is disposed at a periphery of the cover plate and exposed to an outside. The method includes steps as follows. A tool is used to drive the cover plate to rotate relative to the mounting plate via the indentation such that the engaging structure is disengaged from the locking slot structure. The first handle set is moved away from the door such that the first handle set is dismounted from the door.

0008These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

<figref idref="DRAWINGS">FIG. 1</figref> is a three-dimensional diagram showing a lock mounted on a door according to one embodiment of the present disclosure.

<figref idref="DRAWINGS">FIG. 2</figref> is an exploded diagram showing the lock mounted on the door of <figref idref="DRAWINGS">FIG. 1</figref>.

<figref idref="DRAWINGS">FIG. 3</figref> is another exploded diagram showing the lock mounted on the door of <figref idref="DRAWINGS">FIG. 1</figref>.

<figref idref="DRAWINGS">FIG. 4</figref> is a sectional view showing the lock mounted on the door of <figref idref="DRAWINGS">FIG. 1</figref>.

<figref idref="DRAWINGS">FIG. 5</figref> is a three-dimensional diagram showing a mounting plate of <figref idref="DRAWINGS">FIG. 2</figref>.

<figref idref="DRAWINGS">FIG. 6</figref> is another three-dimensional diagram showing the mounting plate of <figref idref="DRAWINGS">FIG. 2</figref>.

<figref idref="DRAWINGS">FIG. 7</figref> is a three-dimensional diagram showing a cover plate of <figref idref="DRAWINGS">FIG. 2</figref>.

<figref idref="DRAWINGS">FIG. 8</figref> is a front view showing the cover plate of <figref idref="DRAWINGS">FIG. 2</figref>.

<figref idref="DRAWINGS">FIG. 9</figref> is a front view showing a driving plate of <figref idref="DRAWINGS">FIG. 2</figref>.

<figref idref="DRAWINGS">FIG. 10</figref> is a side view showing the driving plate of <figref idref="DRAWINGS">FIG. 2</figref>.

<figref idref="DRAWINGS">FIG. 11</figref> is a schematic view showing a first relative position of the cover plate, a restoring element, the driving plate and the mounting plate.

<figref idref="DRAWINGS">FIG. 12</figref> is a schematic view showing a second relative position of the cover plate, the restoring element, the driving plate and the mounting plate.

<figref idref="DRAWINGS">FIG. 13</figref> is a schematic view showing a third relative position of the cover plate, the restoring element, the driving plate and the mounting plate.

<figref idref="DRAWINGS">FIG. 14</figref> is a schematic view showing a fourth relative position of the cover plate, the restoring element, the driving plate and the mounting plate.

<figref idref="DRAWINGS">FIG. 15</figref> is an enlarged view of a portion A of <figref idref="DRAWINGS">FIG. 14</figref>.

<figref idref="DRAWINGS">FIG. 16</figref> is a flow chart of a method for mounting a lock on a door according to another embodiment of the present disclosure.

<figref idref="DRAWINGS">FIG. 17</figref> is a schematic view illustrating Step <b>210</b>.

<figref idref="DRAWINGS">FIG. 18</figref> is a schematic view illustrating Step <b>220</b>.

<figref idref="DRAWINGS">FIG. 19</figref> is a schematic view illustrating Step <b>230</b>.

<figref idref="DRAWINGS">FIG. 20</figref> is a schematic view illustrating Step <b>240</b>.

<figref idref="DRAWINGS">FIG. 21</figref> is a flow chart of a method for dismounting a lock from a door according to yet another embodiment of the present disclosure.

<figref idref="DRAWINGS">FIG. 22</figref> is a schematic view illustrating Step <b>310</b>.

<figref idref="DRAWINGS">FIG. 23</figref> is a schematic view illustrating Step <b>320</b>.

<figref idref="DRAWINGS">FIG. 24</figref> is a flow chart of a method for dismounting a lock from a door according to yet another embodiment of the present disclosure.

<figref idref="DRAWINGS">FIG. 25</figref> is a schematic view illustrating Step <b>410</b>.

<figref idref="DRAWINGS">FIG. 26</figref> is a schematic view illustrating Step <b>420</b>.

<figref idref="DRAWINGS">FIG. 27</figref> is a three-dimensional diagram showing a mounting plate according to yet another embodiment of the present disclosure.

<figref idref="DRAWINGS">FIG. 28</figref> is another three-dimensional diagram showing the mounting plate of <figref idref="DRAWINGS">FIG. 27</figref>.

<figref idref="DRAWINGS">FIG. 29</figref> is a three-dimensional diagram showing a cover plate corresponding to the mounting plate of <figref idref="DRAWINGS">FIG. 27</figref>.

<figref idref="DRAWINGS">FIG. 30</figref> is another three-dimensional diagram showing the cover plate of <figref idref="DRAWINGS">FIG. 29</figref>.

<figref idref="DRAWINGS">FIG. 31</figref> is a flow chart of a method for mounting a lock on a door according to yet another embodiment of the present disclosure.

<figref idref="DRAWINGS">FIG. 32</figref> is a flow chart of a method for dismounting a lock from a door according to yet another embodiment of the present disclosure.

DETAILED DESCRIPTION

0041Please refer to <figref idref="DRAWINGS">FIG. 1</figref> to <figref idref="DRAWINGS">FIG. 4</figref>. <figref idref="DRAWINGS">FIG. 1</figref> is a three-dimensional diagram showing a lock <b>10</b> mounted on a door <b>20</b> according to one embodiment of the present disclosure. <figref idref="DRAWINGS">FIG. 2</figref> is an exploded diagram showing the lock <b>10</b> mounted on the door <b>20</b> of <figref idref="DRAWINGS">FIG. 1</figref>. <figref idref="DRAWINGS">FIG. 3</figref> is another exploded diagram showing the lock <b>10</b> mounted on the door <b>20</b> of <figref idref="DRAWINGS">FIG. 1</figref>. <figref idref="DRAWINGS">FIG. 4</figref> is a sectional view showing the lock <b>10</b> mounted on the door <b>20</b> of <figref idref="DRAWINGS">FIG. 1</figref>. In <figref idref="DRAWINGS">FIG. 1</figref> to <figref idref="DRAWINGS">FIG. 4</figref>, the lock <b>10</b> defines a rotating axis X (shown in chain line) and is mounted on a mounting hole <b>23</b> of the door <b>20</b>. The lock <b>10</b> includes two fastening members <b>100</b>, a first handle set <b>110</b>, a mounting plate <b>170</b>, a latch mechanism <b>180</b> and a second handle set <b>190</b>. The first handle set <b>110</b> and the mounting plate <b>170</b> are disposed on a side <b>21</b> of the door <b>20</b>. The second handle set <b>190</b> is disposed on another side <b>22</b> of the door <b>20</b>. The latch mechanism <b>180</b> is inserted into the mounting hole <b>23</b> and is fixed on the door <b>20</b> via two screws <b>181</b>.

0042Please refer to <figref idref="DRAWINGS">FIG. 5</figref> and <figref idref="DRAWINGS">FIG. 6</figref>. <figref idref="DRAWINGS">FIG. 5</figref> is a three-dimensional diagram showing the mounting plate <b>170</b> of <figref idref="DRAWINGS">FIG. 2</figref>. <figref idref="DRAWINGS">FIG. 6</figref> is another three-dimensional diagram showing the mounting plate <b>170</b> of <figref idref="DRAWINGS">FIG. 2</figref>. The mounting plate <b>170</b> includes a mounting plate body <b>171</b> and two protruding lugs <b>172</b>. The mounting plate body <b>171</b> includes four locking slot structures <b>174</b>. The two protruding lugs <b>172</b> are connected to the mounting plate body <b>171</b> and protrude from the mounting plate body <b>171</b> toward the first handle set <b>110</b> along the rotating axis X. Each of the protruding lugs <b>172</b> includes a fastening hole <b>173</b>. The fastening members <b>100</b> are inserted through the fastening holes <b>173</b> of the protruding lugs <b>172</b> to fix the mounting plate <b>170</b> on the door <b>20</b>.

0043Please refer to <figref idref="DRAWINGS">FIG. 2</figref> and <figref idref="DRAWINGS">FIG. 3</figref>. The first handle set <b>110</b> includes four engaging structures <b>143</b> and a decoration cover <b>130</b>. The four engaging structures <b>143</b> are engaged with the four locking slot structures <b>174</b>, respectively, such that the first handle set <b>110</b> is assembled and fixed on the mounting plate <b>170</b>. The decoration cover <b>130</b> covers the mounting plate <b>170</b>. The decoration cover <b>130</b> includes two openings <b>131</b> corresponding to the two fastening holes <b>173</b> (shown in <figref idref="DRAWINGS">FIG. 5</figref>). As shown in <figref idref="DRAWINGS">FIG. 4</figref>, a dimension d<b>1</b> of the opening <b>131</b> of the decoration cover <b>130</b> is greater than a maximum radial dimension d<b>3</b> of the fastening member <b>100</b>. As such, a tool can be used to directly unfasten the fastening member <b>100</b> via the opening <b>131</b> of the decoration cover <b>130</b>, such that the mounting plate <b>170</b> is no longer fixed to the door <b>20</b>, and the mounting plate <b>170</b> and the first handle set <b>110</b> assembled on the mounting plate <b>170</b> can be dismounted from the door <b>20</b>. Therefore, it is easy to dismount the lock <b>10</b> according to the present disclosure. Furthermore, as shown in FIG. <b>4</b>, the two protruding lugs <b>172</b> protrude from the mounting plate body <b>171</b> toward the first handle set <b>110</b> along the rotating axis X, such that a distance d<b>4</b> between the protruding lug <b>172</b> and a central point (not labeled) of the opening <b>131</b> of the decoration cover <b>130</b> can be shortened, which is favorable for directly removing the fastening member <b>100</b> via the opening <b>131</b> of the decoration cover <b>130</b>.

0044Specifically, the first handle set <b>110</b> includes a first handle <b>120</b>, an axial tube <b>121</b>, the decoration cover <b>130</b>, a cover plate <b>140</b>, a restoring element <b>150</b> and a driving plate <b>160</b>. The first handle <b>120</b> is connected with the axial tube <b>121</b>, and the axial tube <b>121</b> is connected with the driving plate <b>160</b>. In the embodiment, the four hooks <b>121</b><i>a </i>of the axial tube <b>121</b> are engaging into the four hook slots <b>164</b> of the driving plate <b>160</b> (shown in <figref idref="DRAWINGS">FIG. 9</figref>), such that the decoration cover <b>130</b>, the cover plate <b>140</b> and the restoring element <b>150</b> can be fixed between the first handle <b>120</b> and the driving plate <b>160</b> to form the first handle set <b>110</b>.

0045The decoration cover <b>130</b> further includes two side slots <b>132</b> disposed at a periphery of the decoration cover <b>130</b>.

0046The cover plate <b>140</b> is disposed between the decoration cover <b>130</b> and the mounting plate <b>170</b>. Please refer to <figref idref="DRAWINGS">FIG. 7</figref> and <figref idref="DRAWINGS">FIG. 8</figref>. <figref idref="DRAWINGS">FIG. 7</figref> is a three-dimensional diagram showing the cover plate <b>140</b> of <figref idref="DRAWINGS">FIG. 2</figref>. <figref idref="DRAWINGS">FIG. 8</figref> is a front view showing the cover plate <b>140</b> of <figref idref="DRAWINGS">FIG. 2</figref>. The cover plate <b>140</b> includes a cover plate body <b>141</b>, two second abutting features and two limiting posts <b>146</b>. In the embodiment, each of the second abutting features is an obstruction post <b>144</b> protruding from the cover plate body <b>141</b>. However, the present disclosure is not limited thereby. The function of the second abutting features is illustrated below. Each of the limiting posts <b>146</b> is protruding from the cover plate body <b>141</b> for limiting a position of the restoring element <b>150</b>. The cover plate body <b>141</b> includes two penetrating holes <b>142</b>, the four engaging structures <b>143</b> and two indentations <b>145</b>. The penetrating holes <b>142</b> are corresponding to the fastening holes <b>173</b> and the openings <b>131</b>. As shown in <figref idref="DRAWINGS">FIG. 4</figref>, a dimension d<b>2</b> of the penetrating hole <b>142</b> is greater than the maximum radial dimension d<b>3</b> of the fastening member <b>100</b>. As such, the fastening member <b>100</b> can pass through the penetrating hole <b>142</b> and can be removed from the opening <b>131</b> of the decoration cover <b>130</b>. The engaging structures <b>143</b> are corresponding to the locking slot structures <b>174</b> of the mounting plate <b>170</b>. The engaging structures <b>143</b> are disposed at a periphery of the cover plate body <b>141</b>, and each of the engaging structures <b>143</b> includes an elastic protruding portion <b>143</b><i>a </i>and an opening structure <b>143</b><i>b</i>. An included angle θ between two engaging structures <b>143</b> adjacent to each other can be 80 degrees to 100 degrees. Specifically, when the included angle θ between two engaging structures <b>143</b> adjacent to each other is 90 degrees, the four engaging structures <b>143</b> are disposed symmetrically, which is favorable for enhancing the engaging stability. When the included angle θ between two engaging structures <b>143</b> adjacent to each other is greater than 90 degrees and is less than 100 degrees, or when the included angle θ between two engaging structures <b>143</b> adjacent to each other is greater than 80 degrees and is less than 90 degrees, it is favorable for identifying the direction of the cover plate <b>140</b> and is favorable for the fool-proof property. The indentations <b>145</b> are disposed at the periphery of the cover plate body <b>141</b> and are corresponding to the side slots <b>132</b> of the decoration cover <b>130</b>, such that the indentations <b>145</b> can be exposed to an outside through the side slots <b>132</b>.

0047Please refer to <figref idref="DRAWINGS">FIG. 2</figref> and <figref idref="DRAWINGS">FIG. 3</figref>. The restoring element <b>150</b> is disposed between the cover plate <b>140</b> and the driving plate <b>160</b>. The restoring element <b>150</b> is for providing a restoring force to the driving plate <b>160</b>. Herein, the restoring element <b>150</b> is a torsion spring and includes a first leg <b>151</b> and a second leg <b>152</b>. The driving plate <b>160</b> is disposed on the cover plate body <b>141</b> and rotatable relative to the rotating axis X. That is, the driver plate <b>160</b> is disposed on the cover plate body <b>141</b> in a manner that the driving plate <b>160</b> is rotatable around the rotating axis X.

0048Please refer to <figref idref="DRAWINGS">FIG. 9</figref> and <figref idref="DRAWINGS">FIG. 10</figref>. <figref idref="DRAWINGS">FIG. 9</figref> is a front view showing the driving plate <b>160</b> of <figref idref="DRAWINGS">FIG. 2</figref>. <figref idref="DRAWINGS">FIG. 10</figref> is a side view showing the driving plate <b>160</b> of <figref idref="DRAWINGS">FIG. 2</figref>. The driving plate <b>160</b> includes a first abutting feature, a second protruding tab <b>162</b>, a center hole <b>163</b>, four hook slots <b>164</b> and a limiting slot <b>165</b>. In the embodiment, the first abutting feature is a first protruding tab <b>161</b>, the first abutting feature of the driving plate <b>160</b> is for abutting against the second abutting feature of the cover plate <b>140</b>. With the first abutting feature abutting against the second abutting feature, when the driving plate <b>160</b> is operated to rotate, the cover plate <b>140</b> can be driven to rotate with the driving plate <b>160</b>. In the embodiment, the first abutting feature is the first protruding tab <b>161</b> and the second abutting feature is the obstruction post <b>144</b>, which are only for exemplary and the present disclosure is not limited thereto. Any structure or configuration capable of achieving the aforementioned function can be the first abutting feature and the second abutting feature of the present disclosure. The first protruding tab <b>161</b> is perpendicular to the rotating axis X and extended outwardly. The second protruding tab <b>162</b> is perpendicular to the rotating axis X and extended outwardly. As shown in <figref idref="DRAWINGS">FIG. 10</figref>, the second protruding tab <b>162</b> is spaced from the first protruding tab <b>161</b> by a distance d<b>5</b> along the rotating axis X, such that the second protruding tab <b>162</b> is blockable by the fastening member <b>100</b> when the driving plate <b>160</b> is operated to rotate. The limiting slot <b>165</b> is provided for the first leg <b>151</b> and the second leg <b>152</b> of the restoring element <b>150</b> to move limitedly in the limiting slot <b>165</b>. The limiting slot <b>165</b> includes a first limiting end <b>165</b><i>a </i>and a second limiting end <b>165</b><i>b</i>. When the restoring element <b>150</b> does not accumulate an elastic force, the first leg <b>151</b> is close to the first limiting end <b>165</b><i>a</i>, and the second leg <b>152</b> is close to the second limiting end <b>165</b><i>b. </i>

0049Please refer to <figref idref="DRAWINGS">FIG. 6</figref>, each of the locking slot structures <b>174</b> of the mounting plate <b>170</b> includes an entrance portion <b>175</b>, a raised portion <b>176</b> and a holding portion <b>177</b> connected with each other. The holding portion <b>177</b> includes a notch <b>177</b><i>a </i>and a baffle <b>177</b><i>b. </i>

0050Please refer to <figref idref="DRAWINGS">FIG. 2</figref>, the latch mechanism <b>180</b> includes a transfer hole <b>182</b>, a first through hole <b>183</b>, a second through hole <b>184</b> and a latch tongue <b>185</b>. Herein, the shapes of the first through hole <b>183</b> and the second through hole <b>184</b> are different. However, the present disclosure is not limited thereto. In other embodiment, the shapes of the first through hole <b>183</b> and the second through hole <b>184</b> can be the same. The second handle set <b>190</b> can include a transfer tube <b>191</b>, two screw posts <b>192</b> and a second handle <b>193</b>. The transfer tube <b>191</b> inserts through the transfer hole <b>182</b>, and the two screw posts <b>192</b> insert through the first through hole <b>183</b> and the second through hole <b>184</b>, respectively. The second handle <b>193</b> is connected to the transfer tube <b>191</b> in a manner that the second handle <b>193</b> and the transfer tube <b>191</b> can move synchronously. The transfer tube <b>191</b> is connected to the driving plate <b>160</b>. Because the transfer tube <b>191</b> passes through the transfer hole <b>182</b> of the latch mechanism <b>180</b> and the center hole <b>163</b> of the driving plate <b>160</b>, and the hooks <b>121</b><i>a </i>of the axial tube <b>121</b> are engaged with the hook slots <b>164</b> of the driving plate <b>160</b>, the first handle <b>120</b>, the driving plate <b>160</b> and the second handle <b>193</b> are connected in a manner that the first handle <b>120</b>, the driving plate <b>160</b> and the second handle <b>193</b> can move synchronously. That is, when the first handle <b>120</b> is rotated, the driving plate <b>160</b> and the second handle <b>193</b> can rotate with the first handle <b>120</b>. Similarly, when the second handle <b>193</b> is rotated, the driving plate <b>160</b> and the first handle <b>120</b> can rotate with the second handle <b>193</b>. Furthermore, the latch tongue <b>185</b> of the latch mechanism <b>180</b> can be driven by rotating the first handle <b>120</b> or the second handle <b>193</b>. In the embodiment, the screw posts <b>192</b> are corresponding to the fastening holes <b>173</b> of the protruding lugs <b>172</b>. The fastening members <b>100</b> are inserted through the fastening holes <b>173</b> of the protruding lugs <b>172</b> and fastened into the screw posts <b>192</b>, respectively, such that the mounting plate <b>170</b> and the second handle set <b>190</b> are fixed on the door <b>20</b> simultaneously. However, the present disclosure is not limited thereto. The mounting plate <b>170</b> and the second handle set <b>190</b> can align with the latch mechanism <b>180</b> respectively and then be fixed to the door <b>20</b> by other fixing means.

0051With the aforementioned structure, the driving plate <b>160</b> is operated to rotate such that the first protruding tab <b>161</b> abuts against the obstruction post <b>144</b> for driving the cover plate <b>140</b> to rotate with the driving plate <b>160</b>, such that the engaging structure <b>143</b> is brought to engage with the locking slot structure <b>174</b>, and the first handle set <b>110</b> is assembled and fixed on the mounting plate <b>170</b>. <figref idref="DRAWINGS">FIG. 11</figref> to <figref idref="DRAWINGS">FIG. 14</figref> are provided for illustrating how to operate the driving plate <b>160</b> to bring the engaging structure <b>143</b> to engage with the locking slot structure <b>174</b>. For clearly illustrating, only relevant elements are shown in <figref idref="DRAWINGS">FIG. 11</figref> to <figref idref="DRAWINGS">FIG. 14</figref>, i.e., only the cover plate <b>140</b>, the restoring element <b>150</b> (only the first leg <b>151</b> and the second leg <b>152</b> are shown), the driving plate <b>160</b> and the mounting plate <b>170</b> are shown in <figref idref="DRAWINGS">FIG. 11</figref> to <figref idref="DRAWINGS">FIG. 14</figref>, and the elements covered by the mounting plate <b>170</b> (such as the penetrating holes <b>142</b> and the obstruction posts <b>144</b> of the cover plate <b>140</b>) are depicted in dashed line.

0052First, the cover plate <b>140</b> of the first handle set <b>110</b> is rotated, such that the engaging structure <b>143</b> of the cover plate <b>140</b> is aligned with the entrance portion <b>175</b> of the locking slot structure <b>174</b> of the mounting plate <b>170</b>. Specifically, the elastic protruding portion <b>143</b><i>a </i>of the engaging structure <b>143</b> is aligned with the entrance portions <b>175</b> of the locking slot structure <b>174</b>, as shown in <figref idref="DRAWINGS">FIG. 11</figref>. Then the first handle set <b>110</b> is moved toward the door <b>20</b> along the rotating axis X, such that the elastic protruding portion <b>143</b><i>a </i>of the engaging structure <b>143</b> enters into the entrance portion <b>175</b>.

0053Second, the first handle <b>120</b> of the first handle set <b>110</b> is rotated to bring the driving plate <b>160</b> to rotate with the first handle <b>120</b> till the first protruding tab <b>161</b> abuts against the obstruction post <b>144</b>, as shown in <figref idref="DRAWINGS">FIG. 12</figref>. By this time, the first leg <b>151</b> of the restoring element <b>150</b> is blocked by the limiting post <b>146</b> and stays at the same position, and the second leg <b>152</b> of the restoring element <b>150</b> is brought to rotate by the second limiting end <b>165</b><i>b </i>of the driving plate <b>160</b>, such that the restoring element <b>150</b> accumulates an elastic force.

0054Then the first handle <b>120</b> of the first handle set <b>110</b> is continuously rotated to bring the driving plate <b>160</b> to rotate with the first handle <b>120</b> continuously. Because the first protruding tab <b>161</b> abuts against the obstruction post <b>144</b>, the cover plate <b>140</b> is brought to rotate with the driving plate <b>160</b>. When the cover plate <b>140</b> is rotated, the elastic protruding portion <b>143</b><i>a </i>of the engaging structure <b>143</b> of the cover plate <b>140</b> is brought to enter into the holding portion <b>177</b> from the entrance portion <b>175</b> via slidably passing the raised portion <b>176</b>, such that the engaging structure <b>143</b> and the locking slot structure <b>174</b> are in an engagement state, as shown in <figref idref="DRAWINGS">FIG. 13</figref>. Furthermore, a position of the second protruding tab <b>162</b> is corresponding to a position of the penetrating hole <b>142</b> of the cover plate <b>140</b>. That is, when the elastic protruding portion <b>143</b><i>a </i>is located at the holding portion <b>177</b> and the engaging structure <b>143</b> and the locking slot structure <b>174</b> are in the engagement state, the second protruding tab <b>162</b> abuts against the fastening member <b>100</b> (which can refer to the position relationship of the fastening member <b>100</b> and the penetrating hole <b>142</b> shown in <figref idref="DRAWINGS">FIG. 2</figref> and <figref idref="DRAWINGS">FIG. 3</figref>). Accordingly, the disengagement of the engaging structure <b>143</b> and the locking slot structure <b>174</b> caused by the elastic protruding portion <b>143</b><i>a </i>separated from the holding portion <b>177</b> due to excessive rotation of the driving plate <b>160</b> and the cover plate <b>140</b> can be prevented.

0055Since the engaging structure <b>143</b> and the locking slot structure <b>174</b> are in the engagement state, which refers that the first handle set <b>110</b> has been assembled on the mounting plate <b>170</b>. By this time, let go the first handle <b>120</b>, the restoring element <b>150</b> releases the elastic force such that the second leg <b>152</b> of the restoring element <b>150</b> rotate reversely. With the second leg <b>152</b> abutting against the second limiting end <b>165</b><i>b </i>of the driving plate <b>160</b>, the driving plate <b>160</b> is brought back to an initial position, as shown in <figref idref="DRAWINGS">FIG. 14</figref>.

0056<figref idref="DRAWINGS">FIG. 15</figref> is an enlarged view of a portion A of <figref idref="DRAWINGS">FIG. 14</figref>. As shown in <figref idref="DRAWINGS">FIG. 15</figref>, when the engaging structure <b>143</b> is engaged with the locking slot structure <b>174</b>, the elastic protruding portion <b>143</b><i>a </i>is engaged with the notch <b>177</b><i>a</i>, and the baffle <b>177</b><i>b </i>is inserted between the elastic protruding portion <b>143</b><i>a </i>and the cover plate body <b>141</b>. More specifically, the baffle <b>177</b><i>b </i>is inserted into the opening structure <b>143</b><i>b </i>between the elastic protruding portion <b>143</b><i>a </i>and the cover plate body <b>141</b>. As such, the engaging stability between the engaging structure <b>143</b> and the locking slot structure <b>174</b> can be enhanced.

0057According to the above embodiment, the restoring element <b>150</b> is for providing the restoring force to the driving plate <b>160</b>. Therefore, the restoring element <b>150</b> is selective. In other embodiment, the restoring element <b>150</b> can be omitted according to practical demands, such as for reducing weight or cost. When the restoring element <b>150</b> is omitted, and the engaging structure <b>143</b> and the locking slot structure <b>174</b> are in the engagement state, the driving plate <b>160</b> can be brought back to the initial position by rotating the first handle <b>120</b> directly.

0058<figref idref="DRAWINGS">FIG. 16</figref> is a flow chart of a method <b>200</b> for mounting a lock on a door according to another embodiment of the present disclosure. The method <b>200</b> includes Step <b>210</b>, Step <b>220</b>, Step <b>230</b> and Step <b>240</b>. Please also refer to <figref idref="DRAWINGS">FIG. 17</figref> to <figref idref="DRAWINGS">FIG. 20</figref>, <figref idref="DRAWINGS">FIG. 17</figref> to <figref idref="DRAWINGS">FIG. 20</figref> are schematic views illustrating Step <b>210</b> to Step <b>240</b>. The lock adaptable for the method <b>200</b> includes a mounting plate and a first handle set. The mounting plate includes a locking slot structure. The first handle set includes a cover plate, a first handle and a first abutting feature. The cover plate includes an engaging structure and a second abutting structure. The first handle is rotatably connected to the cover plate. The first abutting feature is connected to the first handle in a manner that the first abutting feature is moved synchronously with the first handle. For details of the elements of the lock adaptable for the method <b>200</b>, reference can be made to the elements having the same name in the lock <b>10</b>. The method <b>200</b> can be used to mount the lock <b>10</b> on the door <b>20</b> of <figref idref="DRAWINGS">FIG. 1</figref> to <figref idref="DRAWINGS">FIG. 15</figref>. For specific explanation, herein the lock <b>10</b> and the door <b>20</b> in <figref idref="DRAWINGS">FIG. 1</figref> to <figref idref="DRAWINGS">FIG. 15</figref> are used as the example. However, the lock adaptable for the method <b>200</b> is not limited thereto. Furthermore, the decoration cover <b>130</b> is omitted for illustrating clearly.

0059In Step <b>210</b>, the mounting plate <b>170</b> is fixed on the side <b>21</b> of the door <b>20</b>. As shown in <figref idref="DRAWINGS">FIG. 17</figref>, <figref idref="DRAWINGS">FIG. 2</figref> and <figref idref="DRAWINGS">FIG. 5</figref>, the fastening member <b>100</b> can be inserted through the fastening hole <b>173</b> of the protruding lug <b>172</b> to fix the mounting plate <b>170</b> on the door <b>20</b> by using a tool <b>30</b>, such as a Phillips screwdriver. Specifically, the latch mechanism <b>180</b> can be inserted into the mounting hole <b>23</b> and fixed to the door <b>20</b> through the screws <b>181</b>. Then the second handle set <b>190</b> is aligned with the latch mechanism <b>180</b>, such that the transfer tube <b>191</b> is inserted into the transfer hole <b>182</b> and the two screw posts <b>192</b> are inserted into the first through hole <b>183</b> and the second through hole <b>184</b>, respectively. Afterward, the fastening member <b>100</b> is inserted through the fastening hole <b>173</b> of the protruding lug <b>172</b> and is fastened into the screw post <b>192</b>. As such, the mounting plate <b>170</b> and the second handle set <b>190</b> can be fixed on the two sides <b>20</b>, <b>21</b> of the door <b>20</b>, respectively.

0060In Step <b>220</b>, the engaging structure <b>143</b> of the cover plate <b>140</b> is aligned with the locking slot structure <b>174</b> of the mounting plate <b>170</b>. As shown in <figref idref="DRAWINGS">FIG. 18</figref> and <figref idref="DRAWINGS">FIG. 11</figref>, in this step, the cover plate <b>140</b> of the first handle set <b>110</b> is rotated to align the elastic protruding portion <b>143</b><i>a </i>of the engaging structure <b>143</b> with the entrance portion <b>175</b> of the mounting plate <b>170</b> (the position relationship of the engaging structure <b>143</b> and the locking slot structure <b>174</b> are shown in <figref idref="DRAWINGS">FIG. 11</figref>). Then the cover plate <b>140</b> of the first handle set <b>110</b> is moved toward the door <b>20</b> along the direction of the arrow shown in <figref idref="DRAWINGS">FIG. 18</figref>. As such, the elastic protruding portion <b>143</b><i>a </i>of the engaging structure <b>143</b> enters into the entrance portion <b>175</b> of the locking slot structure <b>174</b>.

0061In Step <b>230</b>, the first handle <b>120</b> is rotated such that the first abutting feature abuts against the second abutting feature to bring the cover plate <b>140</b> to rotate with the first handle <b>120</b>. As shown in <figref idref="DRAWINGS">FIG. 19</figref> and <figref idref="DRAWINGS">FIG. 12</figref>, in this step, the first handle <b>120</b> of the first handle set <b>110</b> is rotated along the direction of the curved arrow shown in <figref idref="DRAWINGS">FIG. 19</figref>, such that the driving plate <b>160</b> is rotated with the first handle <b>120</b> till the first protruding tab <b>161</b> (i.e., the first abutting feature) abuts against the obstruction post <b>144</b> (i.e., the second abutting feature), as shown in <figref idref="DRAWINGS">FIG. 12</figref>.

0062In Step <b>240</b>, the engaging structure <b>143</b> is brought to engage with the locking slot structure <b>174</b> to fix the first handle set <b>110</b> on the mounting plate <b>170</b>. As shown in <figref idref="DRAWINGS">FIG. 20</figref> and <figref idref="DRAWINGS">FIG. 13</figref>, the first handle <b>120</b> of the first handle set <b>110</b> is rotated continuously along the direction of the curved arrow shown in <figref idref="DRAWINGS">FIG. 20</figref>. As such, the driving plate <b>160</b> is rotated with the first handle <b>120</b> continuously. Because the first protruding tab <b>161</b> abuts against the obstruction post <b>144</b>, the cover plate <b>140</b> is brought to rotate with the driving plate <b>160</b>. When the cover plate <b>140</b> is rotated, the elastic protruding portion <b>143</b><i>a </i>of the engaging structure <b>143</b> of the cover plate <b>140</b> is brought to enter into the holding portion <b>177</b> from the entrance portion <b>175</b> via slidably passing the raised portion <b>176</b>, such that the engaging structure <b>143</b> and the locking slot structure <b>174</b> are in the engagement state, as shown in <figref idref="DRAWINGS">FIG. 13</figref>, and the first handle set <b>110</b> is fixed on the mounting plate <b>170</b>.

0063According to the aforementioned embodiment, the engaging structure can be engaged with the locking slot structure by rotating the first handle. As such, the first handle set and second handle set are not directly fixed and connected by screws. Accordingly, it does not need to hold the first handle set and second handle set and operate a screwdriver to screw the screws at the same time. Therefore, it is easy to mount the lock by using the method <b>200</b> of the present disclosure.

0064<figref idref="DRAWINGS">FIG. 21</figref> is a flow chart of a method <b>300</b> for dismounting a lock from a door according to yet another embodiment of the present disclosure. The method <b>300</b> includes Step <b>310</b> and Step <b>320</b>. Please also refer to <figref idref="DRAWINGS">FIG. 22</figref> and <figref idref="DRAWINGS">FIG. 23</figref>, <figref idref="DRAWINGS">FIG. 22</figref> and <figref idref="DRAWINGS">FIG. 23</figref> are schematic views illustrating Step <b>310</b> and Step <b>320</b>. The method <b>300</b> can be used to dismount the lock <b>10</b> from the door <b>20</b> of <figref idref="DRAWINGS">FIG. 1</figref> to <figref idref="DRAWINGS">FIG. 15</figref>. For specific explanation, herein the lock <b>10</b> and the door <b>20</b> in <figref idref="DRAWINGS">FIG. 1</figref> to <figref idref="DRAWINGS">FIG. 15</figref> are used as the example. However, the lock adaptable for the method <b>300</b> is not limited thereto.

0065In Step <b>310</b>, the tool <b>30</b> is used to unfasten the fastening member <b>100</b> via the opening <b>131</b> of the decoration cover <b>130</b> such that the fastening member <b>100</b> is no longer in a fastened state. As shown in <figref idref="DRAWINGS">FIG. 22</figref>, the fastening member <b>100</b> can be unfastened via the opening <b>131</b> of the decoration cover <b>130</b> by using the tool <b>30</b>, such as a Phillips screwdriver. As such, the fastening member <b>100</b> is no longer in a fastened state. Specifically, the fastening member <b>100</b> is unfastened from the screw post <b>192</b> (shown in <figref idref="DRAWINGS">FIG. 2</figref>) to be no longer in the fastened state.

0066In Step <b>320</b>, the first handle set <b>110</b> is moved away from the door <b>20</b> such that the first handle set <b>110</b> and the mounting plate <b>170</b> are dismounted from the door <b>20</b>. As shown in <figref idref="DRAWINGS">FIG. 23</figref> and <figref idref="DRAWINGS">FIG. 2</figref>, the first handle set <b>110</b> is moved away from the door <b>20</b> along the direction of the arrow shown in <figref idref="DRAWINGS">FIG. 23</figref>. Because the engaging structure <b>143</b> and the locking slot structure <b>174</b> are still in the engagement state, the first handle set <b>110</b> is still fixed on the mounting plate <b>170</b>. Therefore, when the first handle set <b>110</b> is moved away from the door <b>20</b>, the mounting plate <b>170</b> is also moved away from the door <b>20</b> with the first handle set <b>110</b>, such that the first handle set <b>110</b> and the mounting plate <b>170</b> are dismounted from the door <b>20</b>.

0067Afterwards, the second handle set <b>190</b> can be moved away from the door <b>20</b>, such that the second handle set <b>190</b> is dismounted from the door <b>20</b>. Furthermore, the screws <b>181</b> can be unfastened, and the latch mechanism <b>180</b> can be removed, such that the lock <b>10</b> is completely dismounted from the door <b>20</b>.

0068According to the aforementioned embodiment, with the dimension of the opening of the decoration cover being greater than the maximum radial dimension of the fastening member, the fastening member can be unfastened directly via the opening of the decoration cover by using a tool. As such, the first handle set and the mounting plate can be dismounted from the door and does not require removing the decoration cover before unfastening the fastening member. Therefore, it is easy to dismount the lock by using the method <b>300</b> of the present disclosure.

0069<figref idref="DRAWINGS">FIG. 24</figref> is a flow chart of a method <b>400</b> for dismounting a lock from a door according to yet another embodiment of the present disclosure. The method <b>400</b> includes Step <b>410</b> and Step <b>420</b>. Please also refer to <figref idref="DRAWINGS">FIG. 25</figref> and <figref idref="DRAWINGS">FIG. 26</figref>, which are schematic views illustrating Step <b>410</b> and Step <b>420</b>. The lock adaptable for the method <b>400</b> includes a mounting plate and a first handle set. The mounting plate is fixed on a side of the door and includes a locking slot structure. The first handle set includes a cover plate. The cover plate includes an engaging structure and an indentation. The engaging structure is engaged with the locking slot structure to fix the first handle set on the mounting plate. The indentation is disposed at a periphery of the cover plate and exposed to an outside. For details of the elements of the lock adaptable for the method <b>400</b>, reference may be made to the elements having the same name in the lock <b>10</b>. The method <b>400</b> can be used to dismount the lock <b>10</b> from the door <b>20</b> of <figref idref="DRAWINGS">FIG. 1</figref> to <figref idref="DRAWINGS">FIG. 15</figref>. For specific explanation, herein the lock <b>10</b> and the door <b>20</b> in <figref idref="DRAWINGS">FIG. 1</figref> to <figref idref="DRAWINGS">FIG. 15</figref> are used as the example. However, the lock adaptable for the method <b>400</b> is not limited thereto.

0070In Step <b>410</b>, a tool <b>40</b> is used to drive the cover plate <b>140</b> to rotate relative to the mounting plate <b>170</b> via the indentation <b>145</b> such that the engaging structure <b>143</b> is disengaged from the locking slot structure <b>174</b>. As shown in <figref idref="DRAWINGS">FIG. 25</figref> and <figref idref="DRAWINGS">FIG. 2</figref>, a tool <b>40</b>, such as a flathead screwdriver, can be used to pass the side slot <b>132</b> of the decoration cover <b>130</b> to act on the indentation <b>145</b>, such that the cover plate <b>140</b> is driven to rotate relative to the mounting plate <b>170</b> along the direction of the curved arrow shown in <figref idref="DRAWINGS">FIG. 25</figref>, and the engaging structure <b>143</b> is disengaged from the locking slot structure <b>174</b>. Specifically, the state of the engaging structure <b>143</b> and the locking slot structure <b>174</b> is changed from <figref idref="DRAWINGS">FIG. 13</figref> to <figref idref="DRAWINGS">FIG. 11</figref> via Step <b>410</b>. That is, the elastic protruding portion <b>143</b><i>a </i>is brought to the entrance portion <b>175</b> from the holding portion <b>177</b> via slidably passing the raised portion <b>176</b>.

0071In Step <b>420</b>, the first handle set <b>110</b> is moved away from the door <b>20</b> such that the first handle set <b>110</b> is dismounted from the door <b>20</b>. As shown in <figref idref="DRAWINGS">FIG. 26</figref> and <figref idref="DRAWINGS">FIG. 2</figref>, after Step <b>410</b>, the engaging structure <b>143</b> and the locking slot structure <b>174</b> are no longer in the engagement state. Therefore, the first handle set <b>110</b> is not fixed on the mounting plate <b>170</b> any longer. When the first handle set <b>110</b> is moved away from the door <b>20</b> along the direction of the arrow shown in <figref idref="DRAWINGS">FIG. 26</figref>, the elastic protruding portion <b>143</b><i>a </i>is brought to move away from the entrance portion <b>175</b>, such that the first handle set <b>110</b> is dismounted from the door <b>20</b>.

0072Afterwards, the fastening member <b>100</b> can be unfastened such that the mounting plate <b>170</b> is not fixed on the door <b>20</b>. Then the mounting plate <b>170</b> is moved away from the door <b>20</b> to dismount the mounting plate <b>170</b> from the door <b>20</b>. Moreover, the second handle set <b>190</b> can be moved away from the door <b>20</b> to dismount the second handle set <b>190</b> from the door <b>20</b>. Furthermore, the screws <b>181</b> can be unfastened, and the latch mechanism <b>180</b> can be removed, such that the lock <b>10</b> is completely dismounted from the door <b>20</b>.

0073According to the aforementioned embodiment, by using a tool to act on the indentation to drive the cover plate to rotate relative to the mounting plate, the engaging structure can be disengaged from the locking slot structure, thereby the first handle set can be dismounted from the door. Therefore, it is easy to dismount the lock by using the method <b>400</b> of the present disclosure.

0074Please refer to <figref idref="DRAWINGS">FIG. 27</figref> to <figref idref="DRAWINGS">FIG. 30</figref>. <figref idref="DRAWINGS">FIG. 27</figref> is a three-dimensional diagram showing a mounting plate <b>570</b> according to yet another embodiment of the present disclosure. <figref idref="DRAWINGS">FIG. 28</figref> is another three-dimensional diagram showing the mounting plate <b>570</b> of <figref idref="DRAWINGS">FIG. 27</figref>. <figref idref="DRAWINGS">FIG. 29</figref> is a three-dimensional diagram showing a cover plate <b>540</b> corresponding to the mounting plate <b>570</b> of <figref idref="DRAWINGS">FIG. 27</figref>. <figref idref="DRAWINGS">FIG. 30</figref> is another three-dimensional diagram showing the cover plate <b>540</b> of <figref idref="DRAWINGS">FIG. 29</figref>. Specifically, the mounting plate <b>170</b> and the cover plate <b>140</b> of the lock <b>10</b> in <figref idref="DRAWINGS">FIG. 1</figref> to <figref idref="DRAWINGS">FIG. 15</figref> can be replaced by the mounting plate <b>570</b> and the cover plate <b>540</b>. Other elements mentioned below can be the same as the elements having the same name in the lock <b>10</b> of <figref idref="DRAWINGS">FIG. 1</figref> to <figref idref="DRAWINGS">FIG. 15</figref> when no contradiction is found.

0075As shown in <figref idref="DRAWINGS">FIG. 27</figref> and <figref idref="DRAWINGS">FIG. 28</figref>, the mounting plate <b>570</b> includes a mounting plate body <b>571</b>, two protruding lugs <b>572</b> and two guiding posts <b>578</b>. The two protruding lugs <b>572</b> are connected to the mounting plate body <b>571</b>, and are protruded from the mounting plate body <b>571</b> toward the first handle set along a rotating axis. Each of the protruding lugs <b>572</b> includes a fastening hole <b>573</b>. Each of the guiding posts <b>578</b> is extended and protruded from the mounting plate body <b>571</b>. The mounting plate body <b>571</b> includes four locking slot structures <b>574</b>. The locking slot structures <b>574</b> are disposed at a periphery of the mounting plate body <b>571</b>. Each of the locking slot structures <b>574</b> includes an entrance portion <b>575</b>, a raised portion <b>576</b> and a holding portion <b>577</b> connected with each other. The holding portion <b>577</b> includes a notch <b>577</b><i>a </i>and a baffle <b>577</b><i>b</i>. Other details of the mounting plate <b>570</b> can be the same as that of the mounting plate <b>170</b> when no contradiction is found.

0076As shown in <figref idref="DRAWINGS">FIG. 29</figref> and <figref idref="DRAWINGS">FIG. 30</figref>, the cover plate <b>540</b> includes a cover plate body <b>541</b>, two second abutting features and two limiting posts <b>546</b>. In the embodiment, the second abutting feature is the obstruction post <b>544</b> extended and protruded from the cover plate body <b>541</b>, but the present disclosure is not limited thereto. The limiting post <b>546</b> is extended and protruded from the cover plate body <b>541</b> for limiting a position of the restoring element. The cover plate body <b>541</b> includes two penetrating holes <b>542</b>, four engaging structures <b>543</b>, two indentations <b>545</b> and two guiding slots <b>547</b>. In the embodiment, the shapes of the two guiding slots <b>547</b> are different. However, the present disclosure is not limited thereto. In other embodiment, the shapes of the two guiding slots <b>547</b> can be the same. The engaging structures <b>543</b> are corresponding to the locking slot structures <b>574</b> of the mounting plate <b>570</b>. The engaging structures <b>543</b> are disposed at a periphery of the cover plate body <b>541</b>, and each of the engaging structures <b>543</b> includes an elastic protruding portion <b>543</b><i>a </i>and an opening structure <b>543</b><i>b</i>. In the embodiment, an included angle θ (shown in <figref idref="DRAWINGS">FIG. 8</figref>) between two engaging structures <b>543</b> adjacent to each other is 90 degrees. As such, the four engaging structures <b>543</b> are disposed symmetrically, which is favorable for enhancing the engaging stability. The guiding slot <b>547</b> is corresponding to the guiding post <b>578</b>, and the guiding post <b>578</b> is slidably disposed in the guiding slot <b>547</b>. The guiding slot <b>547</b> has a first end <b>547</b><i>a </i>and a second end <b>547</b><i>b</i>. When the elastic protruding portion <b>543</b><i>a </i>is located at the entrance portion <b>575</b>, the guiding post <b>578</b> is located at the first end <b>547</b><i>a</i>. When the elastic protruding portion <b>543</b><i>a </i>is located at the holding portion <b>577</b>, the guiding post <b>578</b> is located at the second end <b>547</b><i>b</i>. As such, the guiding slot <b>547</b> can provide the position-limiting function, which is favorable for the alignment between the mounting plate <b>570</b> and the cover plate <b>540</b>. Furthermore, when the cover plate <b>540</b> is brought to rotate by the driving plate to engage with the engaging structure <b>543</b> with the locking slot structure <b>574</b>, the disengagement of the engaging structure <b>543</b> and the locking slot structure <b>574</b> caused by the elastic protruding portion <b>543</b><i>a </i>separated from the holding portion <b>577</b> due to excessive rotation of the cover plate <b>540</b> can be prevented. Other details of the cover plate <b>540</b> can be the same as that of the cover plate <b>140</b> when no contradiction is found, and are not recited herein.

0077<figref idref="DRAWINGS">FIG. 31</figref> is a flow chart of a method <b>600</b> for mounting a lock on a door according to yet another embodiment of the present disclosure. The method <b>600</b> includes Step <b>610</b>, Step <b>620</b>, Step <b>630</b> and Step <b>640</b>. The lock adaptable for the method <b>600</b> includes a mounting plate and a first handle set. The mounting plate includes a locking slot structure and a guiding post. The first handle set includes a cover plate, a first handle and a first abutting structure. The cover plate includes an engaging structure, a second abutting structure and a guiding slot. The first handle is rotatably connected to the cover plate. The first abutting feature is connected to the first handle in a manner that the first abutting feature is moved synchronously with the first handle. The method <b>600</b> can be used to mount a lock including the mounting plate <b>570</b> of <figref idref="DRAWINGS">FIG. 27</figref> and <figref idref="DRAWINGS">FIG. 28</figref> and the cover plate <b>540</b> of <figref idref="DRAWINGS">FIG. 29</figref> and <figref idref="DRAWINGS">FIG. 30</figref> on the door <b>20</b>. For specific explanation, herein the lock <b>10</b> including the mounting plate <b>570</b> of <figref idref="DRAWINGS">FIG. 27</figref> and <figref idref="DRAWINGS">FIG. 28</figref> and the cover plate <b>540</b> of <figref idref="DRAWINGS">FIG. 29</figref> and <figref idref="DRAWINGS">FIG. 30</figref> and the door <b>20</b> are used as the example. However, the lock adaptable for the method <b>600</b> is not limited thereto. Furthermore, details of other elements can refer to the elements having the same name in the lock <b>10</b>.

0078In Step <b>610</b>, the mounting plate <b>570</b> is fixed on a side <b>21</b> of the door <b>20</b>, which can refer to Step <b>210</b> and is not repeated herein.

0079In Step <b>620</b>, the engaging structure <b>543</b> of the cover plate <b>540</b> is aligned with the locking slot structure <b>574</b> of the mounting plate <b>570</b>. By this time, the guiding post <b>578</b> is located at the first end <b>547</b><i>a </i>of the guiding slot <b>547</b>. Other details of Step <b>620</b> can refer to Step <b>220</b> and is not repeated herein.

0080In Step <b>630</b>, the first handle is rotated such that the first abutting feature abuts against the second abutting feature to bring the cover plate <b>540</b> to rotate with the first handle, which can refer to Step <b>230</b> and is not repeated herein.

0081In Step <b>640</b>, the engaging structure <b>543</b> is brought to engage with the locking slot structure <b>574</b> to fix the first handle set on the mounting plate <b>570</b>, such that the guiding post <b>578</b> is brought to move from the first end <b>547</b><i>a </i>of the guiding slot <b>547</b> to the second end <b>547</b><i>b </i>of the guiding slot <b>547</b>. Specifically, when the elastic protruding portion <b>543</b><i>a </i>of the engaging structure <b>543</b> of the cover plate <b>540</b> is brought to enter into the holding portion <b>577</b> from the entrance portion <b>575</b> via slidably passing the raised portion <b>576</b>, the guiding post <b>578</b> moves from the first end <b>547</b><i>a </i>of the guiding slot <b>547</b> to the second end <b>547</b><i>b </i>of the guiding slot <b>547</b>.

0082Other details of the method <b>600</b> can be the same as that of the method <b>200</b> when no contradiction is found, and are not recited herein.

0083<figref idref="DRAWINGS">FIG. 32</figref> is a flow chart of a method <b>700</b> for dismounting a lock from a door according to yet another embodiment of the present disclosure. The method <b>700</b> includes Step <b>710</b> and Step <b>720</b>. The lock adaptable for the method <b>700</b> includes a mounting plate and a first handle set. The mounting plate is fixed on a side of the door and includes a locking slot structure and a guiding post. The first handle set includes a cover plate. The cover plate includes an engaging structure, an indentation and a guiding slot. The engaging structure is engaged with the locking slot structure to fix the first handle set on the mounting plate. The indentation is disposed at a periphery of the cover plate and exposed to an outside. The method <b>700</b> can be used to dismount a lock including the mounting plate <b>570</b> of <figref idref="DRAWINGS">FIG. 27</figref> and <figref idref="DRAWINGS">FIG. 28</figref> and the cover plate <b>540</b> of <figref idref="DRAWINGS">FIG. 29</figref> and <figref idref="DRAWINGS">FIG. 30</figref> from the door <b>20</b>. For specific explanation, herein the lock including the mounting plate <b>570</b> of <figref idref="DRAWINGS">FIG. 27</figref> and <figref idref="DRAWINGS">FIG. 28</figref> and the cover plate <b>540</b> of <figref idref="DRAWINGS">FIG. 29</figref> and <figref idref="DRAWINGS">FIG. 30</figref> and the door <b>20</b> are used as the example. However, the lock adaptable for the method <b>700</b> is not limited thereto. Furthermore, details of other elements can refer to the elements having the same name in the lock <b>10</b>.

0084In Step <b>710</b>, a tool is used to drive the cover plate <b>540</b> to rotate relative to the mounting plate <b>570</b> via the indentation <b>545</b> such that the engaging structure <b>543</b> is disengaged from the locking slot structure <b>574</b>, and the guiding post <b>578</b> is brought to move from the second end <b>547</b><i>b </i>of the guiding slot <b>547</b> to the first end <b>547</b><i>a </i>of the guiding slot <b>547</b>. Other details of Step <b>710</b> can be the same as that of Step <b>410</b>, and are not recited herein.

0085In Step <b>720</b>, the first handle set is moved away from the door <b>20</b> such that the first handle set is dismounted from the door <b>20</b>. Other details of Step <b>720</b> can be the same as that of Step <b>420</b>, and are not recited herein.

0086Other details of the method <b>700</b> can be the same as that of the method <b>400</b> when no contradiction is found, and are not recited herein.

0087Furthermore, the lock including the mounting plate <b>570</b> of <figref idref="DRAWINGS">FIG. 27</figref> and <figref idref="DRAWINGS">FIG. 28</figref> and the cover plate <b>540</b> of <figref idref="DRAWINGS">FIG. 29</figref> and <figref idref="DRAWINGS">FIG. 30</figref> can also be dismounted from the door <b>20</b> by the method <b>300</b>, details thereof are not recited herein.

0088According to the lock of the aforementioned embodiment, the lock has round handles (i.e., the first handle and the second handle are round or approximately round), which is only for exemplary and the present disclosure is not limited thereto. The first handle and the second handle can be formed in other shapes. For example, the first handle and the second handle can be formed as blade handle (also called as flat handle).

0089According to the lock of the aforementioned embodiment, the number of the fastening members is two, and the numbers of the openings, penetrating holes, protruding lugs, fastening holes and screw posts are all corresponding to the number of the fastening members. However, the present disclosure is not limited thereto. The number of the fastening members can be adjusted according to practical demands, and the numbers of the openings, penetrating holes, protruding lugs, fastening holes and screw posts can be adjusted accordingly. For example, the number of the fastening member can be one, which also can achieve the effect to fix the mounting plate on the door.

0090According to the lock of the aforementioned embodiment, the number of the indentations is two, and the number of the side slots is corresponding to the number of the indentations. However, the present disclosure is not limited thereto. The number of the indentations can be adjusted according to practical demands, and the number of the side slots can be adjusted accordingly. For example, the number of the indentation can be one, which also can achieve the effect of rotating the cover plate relative to the mounting plate via the indentation to disengage the engaging structure from the locking slot structure.

0091According to the lock of the aforementioned embodiment, the number of the engaging structures is four, and the number of the locking slot structures is corresponding to the number of the engaging structures. However, the present disclosure is not limited thereto. The number of the engaging structures can be adjusted according to practical demands, and the number of the locking slot structures can be adjusted accordingly. For example, the number of the engaging structure can be one, which also can achieve the effect of engaging the engaging structure with the locking slot structure to fix the first handle set on the mounting plate.

0092According to the lock of the aforementioned embodiment, the number of the obstruction posts is two. However, the present disclosure is not limited thereto. The number of the obstruction post can be one, which also can achieve the effect of abutting the first protruding tab with the obstruction post to rotate the driving plate and bring the cover plate to rotate with the driving plate.

0093According to the present disclosure, the term “first” or “second” is only for naming, and has no special meanings, such as order or quality.

0094Compared to the prior art, the lock of the present disclosure has advantages as follows. With the dimension of the opening of the decoration cover being greater than the maximum radial dimension of the fastening member, the fastening member can be unfastened directly via the opening of the decoration cover by using a tool. As such, the first handle set and the mounting plate can be dismounted from the door and does not require removing the decoration cover before unfastening the fastening member. Therefore, it is easy to dismount the lock of the present disclosure. With the arrangement of the engaging structure and the locking slot structure, the first handle set and second handle set are not directly fixed and connected by screws. Accordingly, it does not need to hold the first handle set and second handle set and operate a screwdriver to screw the screws at the same time. Therefore, it is easy to mount the lock of the present disclosure.

0095According to the method for dismounting the lock from the door of the present disclosure, the fastening member can be unfastened directly via the opening of the decoration cover by using a tool. As such, the first handle set and the mounting plate can be dismounted from the door and does not require removing the decoration cover before unfastening the fastening member. Therefore, it is easy to dismount the lock by using the method of the present disclosure.

0096According to the method for mounting the lock on the door of the present disclosure, the engaging structure can be brought to engage with the locking slot structure by rotating the first handle. As such, the first handle set and second handle set are not directly fixed and connected by screws. Accordingly, it does not need to hold the first handle set and second handle set and operate a screwdriver to screw the screws at the same time. Therefore, it is easy to mount the lock by using the method of the present disclosure.

0097According to the method for dismounting the lock from the door of the present disclosure, the engaging structure can be disengaged from the locking slot structure by using a tool to drive the cover plate to rotate relative to the mounting plate via the indentation, such that the first handle set can be dismounted from the door. Therefore, it is easy to dismount the lock by using the method of the present disclosure.

0098Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.